Method of manufacturing metal baskets.



.I. RIZZARDI'.

METHOD OF MANUFACTURING METAL BASKETS. APPLICATION FILED NOV. 10, 1913.

1,144,668., Patented June 29, 1915.

" ydmg w JOHANN RIZZARDI, 0F CASSEL, GERMANY.

METHOD OF MANUFACTURING METAL BASKETS.

Specification of Letters Patent.

Patented June 29,1915.

Application filed November 10, 1913. Serial No. 800,226.

dent of Cassel, in the German Empire, have 5 invented an ImprovedMethodof-Manufacturing Metal Baskets, of which the following is a full,clear, and exact description.

My invention comprises an apparatus, which shall be used for producingseamless trellis baskets from sheet metal, but by this apparatus only ahalf-finished product can be produced, which must" be still drawn.Further, it is necessary to cut and press the original sheet metalplate, before bringing it into the ap aratus. Therefore also the wholemanufiicture as a whole is fully described hereinafter.

In brder to make my invention and its use more clear, I refer to theaccompanying drawing in which the severalstages of operation during theproduction of a basket are shown and in which similar letters denotesimilar parts throughout the several views, of which:

Figure 1 is a perspective view of a circular sheet metal plate, asemployed in my invention; Fig. 2 shows said plate pressed and providedwith a folded rim; Fig. 3 is an axial section through a cutting deviceemployed in the further treatment of the pressed sheet metal plate; Fig.4 shows the same cutting device artly in section and partly broken away;ig. 5 is a plan view of the plate in question after having been slotted;Fig. 6 is a perspective representation of the finished basket; and Fig.7 shows a portion of the basket on a larger scale.

The basket'is produced from a seamless circular sheet metal plate 1having a central .hole 2. This plate is pressed in known man- .nerbetween a patrix and a matrix, the shape of which is such that the plate1 receives the configuration shown in Fig. 2, resembling an inverteddish and having a flanged rim 3,

roll 9 which is pressed against the conica plate 1 and thus against oneor the other'of but it is also suflicient when the sheet metal thevarious steps 5 in the axial direction of the cone 6, cutting in thismanner the metal just at the step edges and expanding the respectivemetal parts slightly at the respective part of that step. To form theintegral connections between the metal strips forming the trellis work,the cutting edges in question are interrupted in regular intervals, asshown at 10 in Fig. 4, the cutting roll passing away over those placeswithout affecting the metal 1, z. 6. without cutting it.

The stepped cone 6 is screwed upon the threaded end of the spindle 7 ofa lathe and secured in its place by a nut 8, and the cutting roll isattached to the opposite part or support of-the lathe and pressedagainst the dished sheet metal plate 1 aiiixed to the conical support 6,cutting and pre-expanding the metal, as above described.

The sheet metal plates need not be circular, but may be oval if basketsof such crosssection areto be produced the lathe being then, of course,an oval lathe. The steps of the circular or of the oval conical support6 need not be actual separated steps, but they may be connected witheach other so as to form a continuous spiral, whereby the cuttingoperation is facilitated and may be effected in a continuous way. Thebody is now adapted tobe drawn axially in such a manner that it isexpanded in a longitudinal direction and turned into such a basket asrepresented in Fig. 6.

Having now described my invention, what I desire to secure by LettersPatent of the United States is:

tween the ends of the slits on radial lines,

and expanding the plate thus treated in its axial direction for makingsaid slits elliptical'and with pointed ends, substantially as described.I

2. The method of manufacturing metal baskets consisting in pressing asuitably cut sheet metal plate into conical shape, cutting concentricseries of circularly shaped slits into the plate thus prepared, formingstrips decreasing in length, and spaces between the ends of the slits onradial lines, and expanding the plate thus treated in its axialdirection for transforming said circular slits into elliptical oneshaving their ends pointed, substantially as described.

3. The method of manufacturing metal baskets consisting in pressing asuitably cut sheet metal plate into conical shape, cutting concentricseries of circularly shaped slits into the plate thus prepared formingstrips decreasing in length and spaced between the ends of. the slits onradial lines, and expanding the slotted metal parts simultaneously fortransforming said circular slits into elliptical ones having their endspointed, substantially as described.

4. The method of manufacturing metal baskets consisting in pressing asuitably cut sheet metal plate into conical shape, and folding at thesame time its edge, producing in the metal plate thus preparedconcentric series of circularly shaped slits forming strips decreasingin length and spaces between the ends of the slits on radial lines, andexpanding the plate thus treated in its axial direction for transformingsaid circular slits into elliptical ones having their ends pointed,substantially as described.

' 5. The method of manufacturing metal baskets consisting in pressing asuitably cut sheet metal plate into conical shape, producing in theplate thus prepared concentric series of circularly shaped slits formingstrips decreasing in length and spaces between the ends of the slits onradial lines, and expanding the plate thus treated in its axialdirection so as to form the slitted metal parts into meshes diminishingin size in the direction from the periphery to the center, substantiallyas described.

6. The method of manufacturing metal baskets, consisting in producing ina suitably shaped sheet metal plate concentric series of circularlyshaped slits, producing between these slits non-slitted metal partsforming strips decreasing in length and spaces between the ends of theslits on radial lines, and expanding the plate thus. treated in itsaxial direction so as to convert it into a basket presentingelliptically shaped slits with substantially pointed ends, substantiallyas described.

In testimony whereof I aflix my signature in. presence of two witnesses.

J OHANN RIZZARDI.

Witnesses FRITZ ZER'rHY, FERNA Voenn.

